CAR RESTORATION expert Matthew Armstrong has revealed how a "truly neglected" Audi S5 turned out to be his best project to date after this one vital part unleashed the car's true potential.

Fitting a simple aftermarket exhaust to the rear of the second hand model helped “unleash” the car's classic V8 sound. The “roaring” engine and complete rebuild transformed the car from a simple second hand motor into something more likely found in a dealership.